Base64 Encode / Decode
Encode strings to Base64 or decode Base64 back to plain text.
Plain Text
Base64
About Base64 Encode / Decode
The Base64 Encoder / Decoder securely translates text or binary data into a safe ASCII format. Base64 is essential for embedding images in CSS, attaching files in emails, or passing complex payloads via JSON.
How to Use
Real-World Examples
Encoding Credentials for Basic Auth
Encode a username and password into Base64 for use in an HTTP `Authorization: Basic` header.
admin:supersecret
YWRtaW46c3VwZXJzZWNyZXQ=
Best Practices
- Remember that Base64 is an encoding mechanism, not encryption. Do not use Base64 to secure or hide sensitive data.
- Use URL-Safe Base64 (which replaces `+` with `-` and `/` with `_`) if you are passing the encoded string in a URL query parameter.
Pro Tips
You can drag and drop an image file into the editor to instantly generate a Base64 Data URI (e.g., `data:image/png;base64,...`) for CSS embedding.
Frequently Asked Questions
Why does the encoded string end with '='?
The `=` characters act as padding. Base64 requires the output length to be a multiple of 4, so padding is added if the input string doesn't align perfectly.
Is my data secure?
Absolutely. All processing is done locally in your browser. Your data is never sent to our servers.
Security & Privacy
Encoding and decoding are performed purely within your browser using native `btoa()` and `atob()` APIs. No data is sent to external servers.